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https://issues.apache.org/jira/browse/MCOMPILER-355?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16638682#comment-16638682
]
David Bolsover commented on MCOMPILER-355:
------------------------------------------
I don't know if this will help but faced with the exact same
NulPointerException, but associated with a different dependency, I finally
solved the problem by removing <type>pom</type> from the dependency
specification.
I can't see why specifying <type>pom</type> in a dependency should cause a
problem - but it does.
hth
db
> NPE in CompilerMojo.preparePaths on exception
> ---------------------------------------------
>
> Key: MCOMPILER-355
> URL: https://issues.apache.org/jira/browse/MCOMPILER-355
> Project: Maven Compiler Plugin
> Issue Type: Bug
> Environment: ubunutu 18.04.
> Reporter: Brett Sutton
> Priority: Major
> Attachments: testpom.zip
>
>
> I'm getting:
>
> {code:java}
>
> Caused by: java.lang.NullPointerException
> at org.apache.maven.plugin.compiler.CompilerMojo.preparePaths
> (CompilerMojo.java:244)
> at org.apache.maven.plugin.compiler.AbstractCompilerMojo.execute
> (AbstractCompilerMojo.java:787)
> at org.apache.maven.plugin.compiler.CompilerMojo.execute
> (CompilerMojo.java:188)
> at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo
> (DefaultBuildPluginManager.java:134)
> at org.apache.maven.lifecycle.internal.MojoExecutor.execute
> (MojoExecutor.java:208)
> at org.apache.maven.lifecycle.internal.MojoExecutor.execute
> (MojoExecutor.java:154)
> {code}
>
> Appears to be caused by the exception handling assuming the 'cause' will be
> non-null:
> line 244 is:
> {code:java}
> 243 Throwable cause = pathException.getValue().getCause();
> 244 while ( cause.getCause() != null )
> 245 {
> 246 cause = cause.getCause();
> 247 }{code}
>
> Clearly in some cases pathException.getValue().getCause() is returning null.
> This occurs when I try to build a java 10 project using:
> {code:java}
> mvn deploy{code}
>
> I've narrowed the problem down to this dependancy:
> {code:java}
> <!-- https://mvnrepository.com/artifact/org.javamoney/moneta --> <dependency>
> <groupId>org.javamoney</groupId>
> <artifactId>moneta</artifactId>
> <version>1.3</version>
> <type>pom</type>
> </dependency>{code}
> If you remove the above dependency then the problem goes away.
> So there is likely to be two problems here. The initial NPE which should be
> easy to fix and then possibly the root cause of the exception.
> Full pom is:
> {code:java}
> <project xmlns="http://maven.apache.org/POM/4.0.0";
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
> xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
> http://maven.apache.org/xsd/maven-4.0.0.xsd";>
> <modelVersion>4.0.0</modelVersion>
> <groupId>au.com.noojee</groupId>
> <artifactId>noojeebilling.api</artifactId>
> <version>1.4-SNAPSHOT</version>
> <properties>
> </properties>
> <build>
> <sourceDirectory>src/main/java</sourceDirectory>
> <plugins>
> <plugin>
> <artifactId>maven-compiler-plugin</artifactId>
> <version>3.8.0</version>
> <configuration>
> <release>10</release>
> </configuration>
> </plugin>
> </plugins>
> <extensions>
> <extension>
> <groupId>io.packagecloud.maven.wagon</groupId>
> <artifactId>maven-packagecloud-wagon</artifactId>
> <version>0.0.6</version>
> </extension>
> </extensions>
> </build>
> <distributionManagement>
> <repository>
> <id>noojee-internal</id>
> <url>packagecloud+https://packagecloud.io/noojee/internal</url>
> </repository>
> <snapshotRepository>
> <id>noojee-internal</id>
> <url>packagecloud+https://packagecloud.io/noojee/internal</url>
> </snapshotRepository>
> </distributionManagement>
>
> <dependencies>
> <!-- https://mvnrepository.com/artifact/com.google.code.gson/gson -->
> <dependency>
> <groupId>com.google.code.gson</groupId>
> <artifactId>gson</artifactId>
> <version>2.8.5</version>
> </dependency>
> <!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-core
> -->
> <dependency>
> <groupId>org.apache.logging.log4j</groupId>
> <artifactId>log4j-core</artifactId>
> <version>2.9.1</version>
> </dependency>
> <!-- https://mvnrepository.com/artifact/org.javamoney/moneta -->
> <dependency>
> <groupId>org.javamoney</groupId>
> <artifactId>moneta</artifactId>
> <version>1.3</version>
> <type>pom</type>
> </dependency>
> <!-- https://mvnrepository.com/artifact/org.bouncycastle/bcprov-jdk15on -->
> <dependency>
> <groupId>org.bouncycastle</groupId>
> <artifactId>bcprov-jdk15on</artifactId>
> <version>1.59</version>
> </dependency>
> <dependency>
> <groupId>junit</groupId>
> <artifactId>junit</artifactId>
> <version>4.11</version>
> <scope>test</scope>
> </dependency>
>
> </dependencies>
> </project>
> {code}
>
>
>
>
>
>
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